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8k has four times as many pixels as 4k, so at the same bitrate/pixel it would be around 48mbit/sec

Furthermore, the 12mbit/stat is for content that has been encoded in advance, ie nowhere close to real time. If they want to broadcast live sports in 8k, they're not going to get such good compression.

You don’t need 4 times the bitrate because compression technology scales better than linear the higher the resolution.

12mbps is a crappy 4K stream. UHD movies are generally 50mbps+.

The latest Mission Impossible film, which was just released to 4k Bluray, is 70 Mb/s. So you're off by several orders of magnitude even before you get to 8k.

From 4k to 8k it’s 4 times the pixels.